Otrimi, the Ever-Playful [Commander 2020]

Cost: 3 B G U Mutate 1 B G U (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Trample
Whenever this creature deals combat damage to a player, return target creature card with mutate from your graveyard to your hand.